Struct ExternalFunction 

pub struct ExternalFunction {
    pub name: Vec<u8>,
    pub arity: i32,
    pub aggregate: bool,
    pub flags: FunctionFlags,
}

A function an application registered, as the binder needs to see it.

Only what resolution needs: a name, how many arguments it takes, whether it reduces a group, and what it promises about itself. What it does is the machine’s business.

The flags are here because the binder is where the promise is kept (task-1972). Registry::authorize_function had no caller, so direct_only, innocuous and PRAGMA trusted_schema were a policy with a passing unit test and no effect on the engine: a CHECK, an index expression or a generated column could name any registered function whatever its flags. inillucent-sql sits below inillucent-ext and cannot reach the registry, so what the registry knows travels down here with the name.

Fields

name: Vec<u8>

The folded name.

arity: i32

How many arguments it takes, or -1 for any number.

aggregate: bool

Whether it reduces a group rather than a row.

flags: FunctionFlags

What it promises about itself, which decides whether a schema may name it.

Implementations

impl ExternalFunction

pub fn accepts(&self, argc: usize) -> bool

Returns whether this registration answers a call with this many arguments.

Trait Implementations

impl Clone for ExternalFunction

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExternalFunction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ExternalFunction

impl PartialEq for ExternalFunction

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ExternalFunction